{"product_id":"a513-cold-roll-carbon-steel-round-tubing-1-4-in-od-durable-precision","title":"A513 Cold Roll Carbon Steel Round Tubing 1\/4 in OD - Durable Precision","description":"\u003cp\u003eIn this review of the A513 Cold Roll Carbon Steel Round Tubing, the bottom line is simple: this tubing is best for fabricators and DIYers who need a small-diameter, strong metal tube with consistent wall thickness for mechanical or fluid-transfer work. The reviewer found the tubing's primary strength is its combination of cold-rolled yield and the drawn-over-mandrel process, which deliver a smooth bore and reliable wall consistency that matter when fitting into tight assemblies or running short fluid lines.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial strength:\u003c\/strong\u003e A513 1018 carbon steel provides high strength and rigidity suited to pins, shafts, and small structural parts where stiffness is required.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrawn over mandrel:\u003c\/strong\u003e The tubing has a smoother internal bore than non-drawn welded tubing, which reduces turbulence and helps with consistent flow in fluid or HVAC lines.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCold rolled finish:\u003c\/strong\u003e Cold rolling increases yield strength and hardness versus hot-rolled options, benefiting applications that need added durability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact dimensions:\u003c\/strong\u003e The 1\/4 in outside diameter with a 0.035 in wall gives a sturdy, thin-walled tube that fits fractional tubing systems and small fittings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eASTM A513 compliance:\u003c\/strong\u003e Meeting the standard provides quality assurance for industrial and automotive uses.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength and fit:\u003c\/strong\u003e The 36 in length is convenient for short runs and workshop stock, minimizing waste for many common repair jobs.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThe tubing is ideal for hobby machinists, automotive DIYers, and HVAC technicians who need sturdy, small-diameter metal tubing for fuel lines, air conditioning lines, linkage rods, or retrofit projects. Its strength and drawn bore suit applications where a clean internal surface and consistent wall thickness are valuable.\u003c\/p\u003e\n\u003cp\u003eIt is less suitable for projects that require high weldability or ease of machining, or for users who need a larger-diameter seamless tube; those users should consider alloys with higher machinability or different manufacturing methods.\u003c\/p\u003e\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eGood steel quality and strength, making it a reliable choice for mechanical parts and structural small tubes.\u003c\/li\u003e\n\u003cli\u003eDrawn over mandrel process gives a smoother bore and more consistent wall thickness than standard welded tubing.\u003c\/li\u003e\n\u003cli\u003eCold rolled finish increases hardness and yield strength for demanding uses.\u003c\/li\u003e\n\u003cli\u003eMeasured dimensions work well for standard fractional tubing fittings and short runs.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eLower machinability and weldability compared with some softer steels, which can complicate custom fabrication steps.\u003c\/li\u003e\n\u003cli\u003eSome users report the inner diameter is slightly smaller than expected, which may affect tight-tolerance inserts or fluid flow calculations.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003ctd\u003eASTM A513\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003e1018 carbon steel (A513)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutside diameter\u003c\/td\u003e\n\u003ctd\u003e1\/4 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInside diameter\u003c\/td\u003e\n\u003ctd\u003e0.18 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWall thickness\u003c\/td\u003e\n\u003ctd\u003e0.035 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength\u003c\/td\u003e\n\u003ctd\u003e36 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe A513 Cold Roll Carbon Steel Round Tubing is a solid, practical choice for those who need a small-diameter, high-strength tube with a smooth bore and consistent wall. It offers clear value for automotive, HVAC, and general fabrication work where rigidity and internal finish matter, though fabricators who require easier machining or welding should evaluate alternative grades.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIs this tubing suitable for fuel or AC lines?\u003c\/strong\u003e\u003cbr\u003eYes; the drawn-over-mandrel bore and ASTM A513 compliance make it suitable for short fuel or automotive AC line applications, though fitting and sealing should be checked for each installation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan this tube be welded and machined easily?\u003c\/strong\u003e\u003cbr\u003eThe tube can be welded and machined, but A513 1018 carbon steel has slightly reduced weldability and machinability compared with softer steels, so adjust processes accordingly.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre the dimensions accurate for fittings?\u003c\/strong\u003e\u003cbr\u003eDimensions are generally reliable for fractional tubing use, but some users report a slightly smaller inner diameter, so verify fit for tight-tolerance parts.\u003c\/p\u003e","brand":"Online Metals","offers":[{"title":"Default Title","offer_id":48636651176155,"sku":"B000H9K2YI","price":70.18,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/51RCqvxR91L._AC_SL1000_3db973c0-3ea8-4ea8-8725-79f94c4a8865.jpg?v=1778721745","url":"https:\/\/gearmusthave.com\/products\/a513-cold-roll-carbon-steel-round-tubing-1-4-in-od-durable-precision","provider":"GearMustHave","version":"1.0","type":"link"}